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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive - Redwood City, CA 94063 <br /> (415) 364-9600 • FAX (415) 364-9233 <br /> Blaine Tech Services Inc Client Project ID Shell, 4445 N Pershing Ave Stockton <br /> 985 Timothy Drive <br /> San Jose, CA 95133 <br /> Attention Glen Bennett OC Sample Group 3011267 - 71 Reported Jan 15 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst M Nipp M Nipp M Nipp M Nipp <br /> Reporting Units u9/L p9/L p9/L N9/L <br /> Date Analyzed Jan 13 1993 Jan 13 1993 Jan 13 1993 Jan 13 1993 <br /> QC Sample # G3011267 G3011267 63011267 63011267 <br /> Sample Cone N D N D N D N D <br /> Spike Cone <br /> Added 10 10 10 30 <br /> Cone Matrix <br /> Spike 73 74 74 22 <br /> Matrix Spike <br /> % Recovery 73 74 74 73 <br /> Cone Matrix <br /> Spike Dup 77 79 79 24 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 77 79 79 80 <br /> Relative <br /> % Difference 53 65 6 5 8 7 <br />�SEOIJCIA ANALYTICAL °o Recovery Conc of M S Cone of Sampie x 100 <br /> Spike Conc Added <br /> ri WC� Relative%Difference Conc of M S Conc of M S D x 100 <br /> (Conc of M S + Conc of M S D) /2 <br /> rolect Manager 3011267 BLA <3> <br />